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Question 1 of 4
D. Agenda influence through introduction and absorption of neglected demands
Populists influenced the agenda by making demands visible that major parties and later reformers partly absorbed. That is influence without replacement or public authority. A spoiler claim would require evidence about a close result and voters' next preferences; no proportional rule is described.
Question 2 of 4
A. a mechanical effect and a psychological effect
The failure of twelve percent of votes to produce seats is the mechanical effect of single-member plurality allocation. Supporters then anticipate that penalty and coordinate around a viable major party, which is the psychological effect. Ballot access concerns reaching the ballot, while a spoiler effect concerns changing a close winner.
Question 3 of 4
B. Sorting can increase measured party polarization without requiring broad individual movement toward ideological extremes
Sorting makes ideology and party label fit more consistently, reducing cross-pressured categories such as liberal Republicans and conservative Democrats. That compositional change can widen the distance between party averages even when many individuals do not move toward extremes. Affective polarization concerns social dislike, negative partisanship concerns motivation against the rival, and divided government concerns institutional control.
Question 4 of 4
C. negative partisanship and affective polarization
Voting chiefly to stop the rival is negative partisanship: opposition supplies the motivation. Discomfort with a family relationship involving an opposing partisan is affective polarization because it measures social distance. Sorting concerns coalition alignment, and ideological polarization concerns policy distance rather than interpersonal feeling.